In some places it might not have been possible to preach for any length because of the extent of the rites. However, I also suppose that in some places Father (or His Excellency, His Grace, His Lordship, His Eminence) did, in fact, discourse.
Was there a good point made in the sermon you heard at your Mass of Sunday obligation? Let us know. A GOOD point! This isn’t open for griping.
For my part, I reminded people briefly after the first Gospel that we are our rites. Participating in these sacred mysteries makes them present to us, us to them. We reviewed some of the historical events of the day, the 1st Palm Sunday procession into the city, and then the short period before the Day of Preparation for Passover. They were packed with action.